Q. In electrochemistry, what does the Nernst equation relate to?
A.
Concentration and pressure
B.
Temperature and volume
C.
Cell potential and concentration
D.
Mass and energy
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Solution
The Nernst equation relates the cell potential to the concentrations of the reactants and products, allowing for calculation of voltage under non-standard conditions.
Correct Answer:
C
— Cell potential and concentration
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Q. In which type of reaction is the bond dissociation energy most relevant?
A.
Endothermic reaction
B.
Exothermic reaction
C.
Catalytic reaction
D.
Equilibrium reaction
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Solution
Bond dissociation energy is crucial in endothermic reactions where bonds are broken, requiring energy input.
Correct Answer:
A
— Endothermic reaction
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Q. What is the effect of increasing temperature on the equilibrium constant (K) for an exothermic reaction?
A.
Increases K
B.
Decreases K
C.
No effect
D.
Depends on concentration
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Solution
For an exothermic reaction, increasing temperature shifts the equilibrium to the left, decreasing the equilibrium constant K.
Correct Answer:
B
— Decreases K
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Q. What is the hybridization of the central atom in methane (CH4)?
A.
sp
B.
sp2
C.
sp3
D.
sp3d
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Solution
The central carbon atom in methane undergoes sp3 hybridization, forming four equivalent sp3 hybrid orbitals.
Correct Answer:
C
— sp3
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Q. What is the primary driving force for the formation of a precipitate in a double displacement reaction?
A.
Formation of gas
B.
Formation of a solid
C.
Change in temperature
D.
Change in pressure
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Solution
The formation of a solid precipitate is the primary driving force in double displacement reactions, leading to a decrease in solubility.
Correct Answer:
B
— Formation of a solid
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Q. What is the primary reason for the shape of the water molecule?
A.
Electronegativity
B.
Lone pair repulsion
C.
Bond length
D.
Molecular weight
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Solution
The bent shape of the water molecule is due to the repulsion between the two lone pairs on the oxygen atom.
Correct Answer:
B
— Lone pair repulsion
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Q. What is the primary type of bond formed between sodium and chlorine in table salt?
A.
Covalent bond
B.
Ionic bond
C.
Metallic bond
D.
Hydrogen bond
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Solution
Sodium donates an electron to chlorine, resulting in an ionic bond due to the electrostatic attraction between the oppositely charged ions.
Correct Answer:
B
— Ionic bond
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Q. What type of surface interaction is primarily responsible for the adhesion of paint to a wall?
A.
Covalent bonding
B.
Van der Waals forces
C.
Ionic bonding
D.
Hydrogen bonding
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Solution
Van der Waals forces are primarily responsible for the adhesion of paint to a wall, providing weak but significant interactions.
Correct Answer:
B
— Van der Waals forces
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Q. Which factor does NOT affect the rate of a chemical reaction?
A.
Concentration of reactants
B.
Temperature
C.
Presence of a catalyst
D.
Color of reactants
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Solution
The color of reactants does not influence the rate of a chemical reaction, while concentration, temperature, and catalysts do.
Correct Answer:
D
— Color of reactants
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Q. Which molecular geometry corresponds to a molecule with two bonding pairs and no lone pairs on the central atom?
A.
Linear
B.
Trigonal Planar
C.
Tetrahedral
D.
Bent
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Solution
A molecule with two bonding pairs and no lone pairs has a linear geometry due to the arrangement of electron pairs.
Correct Answer:
A
— Linear
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Q. Which molecular geometry is associated with a molecule that has two bonding pairs and no lone pairs?
A.
Linear
B.
Trigonal planar
C.
Tetrahedral
D.
Bent
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Solution
A molecule with two bonding pairs and no lone pairs adopts a linear geometry, as seen in CO2.
Correct Answer:
A
— Linear
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Q. Which principle explains the shift in equilibrium when a stress is applied to a system?
A.
Le Chatelier's Principle
B.
Hess's Law
C.
Raoult's Law
D.
Gibbs Free Energy
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Solution
Le Chatelier's Principle states that if a system at equilibrium is subjected to a change in concentration, temperature, or pressure, the system will adjust to counteract that change.
Correct Answer:
A
— Le Chatelier's Principle
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Q. Which type of intermolecular force is primarily responsible for the high boiling point of water?
A.
Van der Waals
B.
Dipole-dipole
C.
Hydrogen bonding
D.
Ionic
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Solution
Hydrogen bonding is the dominant intermolecular force in water, leading to its relatively high boiling point.
Correct Answer:
C
— Hydrogen bonding
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